/**
 * Encrypt a value with a symmetric key using libsodium
 *
 * @param value - The value to encrypt
 * @param key - The encryption key
 * @returns The base64-encoded encrypted value with nonce
 */
export declare function encrypt(value: string, key: string): Promise<string>;
/**
 * Decrypt a value encrypted with a symmetric key
 *
 * @param encryptedValue - The base64-encoded encrypted value with nonce
 * @param key - The decryption key
 * @returns The decrypted string
 */
export declare function decryptWithKey(encryptedValue: string, key: string): Promise<string>;
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